Electric circuit



I (No Model.)

J. 0. WILSON.

ELECTRIC CIRCUIT.

No. 417,305. Patented Dec. 17, 1889.

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UNITED STATES PATENT OFFICE.

JOHN CORNELIUS WILSON, OF BOSTON, MASSACHUSETTS.

ELECTRIC CIRCUIT.

SPECIFICATION forming part of Letters Patent No. 417,305, dated December 17, 1889. Application filed July 23, 1889. Serial No. 318,409. (No model.)

To all whom it may concern.-

Be it known that 1, JOHN CORNELIUS W1L- SON, of Boston, county of Suffolk, State of Massachusetts, have invented an Improvement in Electric Circuits, of which the following description, in connection with the accompanying drawing, is a specification, like letters on the drawing representing like parts.

This invention has for its object to construct and arrange an electric circuit especially adapted for telephonic communication, whereby the disturbing influences from induction are avoided or neutralized.

In accordance with this invention a metallic loop or circuit is employed, it comprising two wires, preferably running substantially parallel with or adjacent to each other. At the two ends or remote parts of the loop or circuit resistances are included in the line. The telephonic instruments and a condenser are included in a cross or connecting wire between the two wires of the metallic loop and arranged in mutiple arc. Circuitchanging devices of any well-known or suitable construction are included in the metallic loop, preferably designed to transmit signals by makes and breaks. When signals are transmitted, they do not cross from wire to wire, being obstructed by the condenser, whereas, on the otherhand, the telephonic impulses pass through the condenser as over an independent metallic loop. The disturbing effects from any neighboring wire are neutralized in the condenser.

The drawing shows in diagram an electric circuit embodying this invention.

The metallic circuit comprises the wires a 1), arranged to form a complete loop. The circuit a 1) includes the battery 0 and relay d.

As herein shown, several circuit-changing devices, as a,are included in the circuit a b, to which the relay (1 responds.

S represents boxes containing the circuitchanging devices.

Cross or connecting wires 2 are arranged between the wires a b in multiple are, they containing the telephonic instruments 3 and condenser 4. Itwill be seen that the said connecting-wires 2, together with the wires a b or portions of them, form independent metallic loops, and to prevent their shortcircuiting at the remote ends of the line resistances are included, as at 1' 1" although the resistance of the relay (1 may be sufficient at that end of the line.

In practice the signals will be transmitted in any usual or suitable manner, and will pass over the wires (t l); but owing to the interposition of the condenser they will not cross from a to b, or vice versa, while, on the other hand, telephonic impulses will pass through the condenser and over portions of the wires to Z). Any disturbing-wire will act to cause momentary disturbing-impulses of like intensity and polarity to traverse the two wires between which the condensers and telephones are connected, and these impulses necessarily act inductively to neutralize and destroy each other in the same manner as if the telephones were connected in a conductive circuit instead of an inductive one.

I claim 1. A metallic circuit comprising two loops at I), starting and terminating atthe same station, said loops running adjacent to each other, combined with condensers and telephonic instruments arranged in multiple are between the said loops ct b, substantially as described.

2. The combination, with a loop or wire, as a, starting from and returning to a station, of another loop or wire, as 19, running adjacent to said loop or wire a and connected thereto to complete a metallic circuit, and telephonic instruments and condensers connected in multiple are between said loops a 19, substantially as described.

3. The combination, with a loop or wire, as a, starting from and returning to a station, of another loop or wire, as 19, running adjacent to said loop or wire aand connected thereto to form a metallic circuit, and resist ances included in the loops at one end, the connecting-wires 2 and telephonic instruments, and a condenser included in said wires 2, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN CORNELIUS \NILSON.

W'itnesses:

GEO. W. GREGORY, 1;. DEWAR. 

